SAR ERS and SPOT-P satellite data acquired in 1995 and 1993 over the western side of Pinatubo Volcano were analyzed and compared with field data. Multi-temporal SAR ERS-1 data acquired on 9 July and 13 August 1993, with 35 days interval, show that there was significant lahar development. Active lahars manifested as rough surfaces with high degree of brightness in the August data. Active channels can also be identified and delineated, reflected as white and light to dark gray tones, respectively, depending on moisture and textural features. The high capability of ERS-1 to detect moisture content and surfaces covered by water permitted easy recognition of lakes and flooded areas, appearing black when there is quiet standing water or light gray surface when water is wavy due to windy-conditions. The analysis of stereoscopic SPOT-P data for the mapping of ancient (pre-1991) and recent lahar and pyroclastic flow deposits is based on differences in morphology, texture and brightness. Both multi-temporal SPOT and SAR ERS-1 images show temporal and spatial development of the lahars since the eruption of Pinatubo in June 1991.